78 lines
1.3 KiB
JavaScript
78 lines
1.3 KiB
JavaScript
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'use strict'
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module.exports = convert
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function convert(test) {
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if (test == null) {
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return ok
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}
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if (typeof test === 'string') {
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return typeFactory(test)
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}
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if (typeof test === 'object') {
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return 'length' in test ? anyFactory(test) : allFactory(test)
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}
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if (typeof test === 'function') {
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return test
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}
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throw new Error('Expected function, string, or object as test')
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}
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// Utility assert each property in `test` is represented in `node`, and each
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// values are strictly equal.
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function allFactory(test) {
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return all
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function all(node) {
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var key
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for (key in test) {
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if (node[key] !== test[key]) return false
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}
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return true
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}
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}
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function anyFactory(tests) {
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var checks = []
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var index = -1
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while (++index < tests.length) {
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checks[index] = convert(tests[index])
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}
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return any
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function any() {
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var index = -1
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while (++index < checks.length) {
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if (checks[index].apply(this, arguments)) {
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return true
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}
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}
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return false
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}
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}
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// Utility to convert a string into a function which checks a given node’s type
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// for said string.
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function typeFactory(test) {
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return type
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function type(node) {
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return Boolean(node && node.type === test)
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}
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}
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// Utility to return true.
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function ok() {
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return true
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}
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